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The effect of PdZn particle size on reverse-water–gas-shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
42161 45913 2010 4 PDF Available
Title
The effect of PdZn particle size on reverse-water–gas-shift reaction
Abstract

The effect of PdZn particle size on the catalytic activity of Pd/ZnO catalysts for the reverse-water–gas-shift (RWGS) reaction was studied. The PdZn particle size was varied by adjusting Pd loading and reducing the catalysts at different temperatures. XRD and IR spectroscopy characterization confirmed the absence of metallic Pd on the catalyst surface. Consequently, the effect of PdZn alloy particle size on the RWGS reaction can be unambiguously studied without the complication of reactions catalyzed by metallic Pd. The results indicated that the turnover frequency increases as the PdZn crystallite size decreases. Interestingly, this structure relationship between PdZn particle size and RWGS activity is consistent with that previously observed for the steam reforming of methanol, i.e., higher CO selectivity on smaller PdZn particles. Thus, RWGS has been identified as a likely potential reaction pathway to undesired CO formation in methanol steam reforming on Pd/ZnO catalysts for hydrogen production.

Graphical abstractThe effect of PdZn particle size on the activity of Pd/ZnO catalysts for the reverse-water–gas-shift (RWGS) reaction was studied. The results indicated that the turnover frequency increases as the PdZn crystallite size decreases. Interestingly, this relationship is consistent with that previously observed for methanol steam reforming. Thus, RWGS was identified as a likely potential reaction pathway to undesired CO formation in methanol steam reforming on Pd/ZnO catalysts.Figure optionsDownload full-size imageDownload high-quality image (32 K)Download as PowerPoint slide

Keywords
PdZn catalyst; PdZn particle size; PdZn alloy; Reverse-water–gas-shift; CO formation
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The effect of PdZn particle size on reverse-water–gas-shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 379, Issues 1–2, 15 May 2010, Pages 3–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us